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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 65,000 articles authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Application of close-kin mark–recapture to an American black bear population using harvest samples Application of close-kin mark–recapture to an American black bear population using harvest samples
Close-kin mark–recapture (CKMR) offers a promising alternative to traditional mark–recapture methods for estimating wildlife population parameters. CKMR estimates demographic parameters by identifying genetic relationships between individuals, effectively “recapturing” parental genotypes through their offspring's genetic profiles. One key advantage of CKMR over traditional methods is the...
Authors
Anthony Sévêque, Robert Charles Lonsinger, Lisette P. Waits, Kristin E. Brzeski, Sarah L. Mayhew, D. Cody Norton, Caitlin N. Ott-Conn, Tyler R. Petroelje, Anaïs K. Tallon, Maya Weissman, Dana J. Morin
Evidence for exposure to and infection with H5 clade 2.3.4.4b highly pathogenic avian influenza viruses among polar bears inhabiting Alaska Evidence for exposure to and infection with H5 clade 2.3.4.4b highly pathogenic avian influenza viruses among polar bears inhabiting Alaska
No abstract available.
Authors
Andrew M. Ramey, Lindsey S. Mangipane, Todd C. Atwood, Raphaela Stimmelmayr, David S. Rotstein, Christina A. Ahlstrom, Kristin S. Simac, Sarah M Coburn, Mia Kim Torchetti, David E. Stallknecht, Rebecca L. Poulson
Evaluating seedling traits, maintenance and effective costs to support tropical forest restoration practices Evaluating seedling traits, maintenance and effective costs to support tropical forest restoration practices
While large-scale restoration is essential, tropical forest restoration often depends on small-scale practitioners and landowners who produce, plant and maintain trees. Their collective impact on restoring forest diversity and function is substantial, making it critical to address the constraints they face through efficient, effective techniques.We used generalized linear mixed models to...
Authors
Debra A Hamilton, Timothy K Parshall, Lorenzo Vargas Berocal, Rodrigo Alvarado Méndez, Gregory R Goldsmith, Therese M. Donovan
Cognitive and institutional barriers to effective natural resource management under global change Cognitive and institutional barriers to effective natural resource management under global change
Many of the most challenging decisions facing natural resource managers today can be understood as time dependent. The concept of time-dependent decisions is useful when considering natural resource management decisions that are characterized by nonstationarity in the underlying ecological system, uncertainty surrounding key ecological relationships, efficacy of management interventions...
Authors
Madeleine A. Rubenstein, Richard Eugene Waggaman Berl, Iadine Chades, Rebecca S. Epanchin-Niell, Toni Lyn Morelli, Michael C. Runge
Mountain lion prey-selection in a community comprised of native and introduced ungulate species Mountain lion prey-selection in a community comprised of native and introduced ungulate species
Species introductions are a hallmark of human influence on ecosystems worldwide. In communities where native and introduced fauna coexist, predators may select prey based on availability or vulnerability. Free-roaming feral horses (Equus caballus) are a recent addition to North America and have become widespread, abundant, and in some areas serve as major prey for mountain lions (Puma...
Authors
Peter Iacono, Kathryn A. Schoenecker, Jessie Marie Dodge, Patrick Jackson, Kezia Manlove, David Stoner
Harmonizing distributed data in aquatic sciences: Key takeaways from the 2026 ASLO-SIL workshop Harmonizing distributed data in aquatic sciences: Key takeaways from the 2026 ASLO-SIL workshop
No abstract available.
Authors
Robert T. Hensley, Bennett J McAfee, Michael Frederick Meyer, Katalin Patonai, Nicholas Harrison, Kaelin M. Cawley, Frieda B Taub, Mireia Bartons, Asena Goren, Hans-Peter Grossart
An extensive and short-lived episode of mid-Holocene fayalite- bearing high-silica rhyolite eruptions at Mono Craters, California An extensive and short-lived episode of mid-Holocene fayalite- bearing high-silica rhyolite eruptions at Mono Craters, California
Having last erupted ~ 700 years ago, the Mono Craters volcanic chain is an active system with a history of explosive and effusive high-silica rhyolite eruptions. Approximately ~ 30 lava domes and flows range from ~ 42 to ~ 0.7 ka, form a ~ 15 km curvilinear trend, and change mineralogy (biotite-, orthopyroxene-, or fayalite-bearing) and crystallinity through time. However, the eruptive...
Authors
Genna Raine Chiaro, Jorge A. Vazquez, Judith Fierstein, Andrew T. Calvert, Shaul Hurwitz, Joel E. Robinson
A multi-state assessment of per- and polyfluoroalkyl substances (PFAS), pesticides, and antibiotic resistance genes in white-tailed deer (Odocoileus virginianus) of the United States A multi-state assessment of per- and polyfluoroalkyl substances (PFAS), pesticides, and antibiotic resistance genes in white-tailed deer (Odocoileus virginianus) of the United States
Sentinel species provide a vital One Health perspective on ecosystem contamination driven by rising global chemical production. We evaluated white-tailed deer (Odocoileus virginianus; n = 54, 24 states, six matrices) as nationwide bioindicators for PFAS, pesticides, antimicrobial resistance (AMR) genes, and microbiome diversity. PFAS were detected in 100% of deer samples (26 compounds...
Authors
Erin L. Pulster, Dana W. Kolpin, Carrie E. Givens, Michelle L. Hladik, Landon M. Keele, Shannon M. Meppelink, Marina D. Rodriguez, David A. Alvarez, Brianna M. Williams, Stephanie E. Gordon, Laura E. Hubbard
Cultural pollen delivery is not needed to account for consistent, trace abundances of Zea mays pollen in the sediments of Santa Fe Lake Cultural pollen delivery is not needed to account for consistent, trace abundances of Zea mays pollen in the sediments of Santa Fe Lake
Roos (2026) proposes an intriguing cultural mechanism to account for the rare (
Authors
Paul D. Henne, Susann Stolze, Natalie M. Kehrwald, Rebecca Lynn Brice, Craig D. Allen
Decision-centered systems for the future of wildlife conservation Decision-centered systems for the future of wildlife conservation
The future of wildlife conservation will be determined by how well we decide, not simply by how much we know. Advances in quantitative ecology, sensor networks, and artificial intelligence have enhanced the field's ability to estimate population states and predict ecological dynamics. Yet, these technological and analytical advancements have not translated into proportional improvements...
Authors
Angela K. Fuller
How tough a passage? Nonnative fish entrainment survivability at a major dam in the western USA How tough a passage? Nonnative fish entrainment survivability at a major dam in the western USA
The Colorado River downstream of Glen Canyon Dam (GCD) in the southwest USA demonstrates anthropogenic modification including altered flow and temperature regimes and established nonnative species in upstream reservoirs. Water overallocation and megadrought are contributing to new potential invasion pathways for nonnative fishes through dam releases. In this study, we quantified factors...
Authors
Barrett Friesen, Casey A. Pennock, Phaedra E. Budy
Production of secondary microbial methane from a gas hydrate-bearing reservoir at the HYDRATE P1 Production Test Well (PTW-1) on the Alaskan North Slope Production of secondary microbial methane from a gas hydrate-bearing reservoir at the HYDRATE P1 Production Test Well (PTW-1) on the Alaskan North Slope
Gas hydrate in the Alaskan North Slope (ANS) is believed to contain as much methane as the known conventional gas accumulations in the Prudhoe Bay field. The JOGMEC-DOE-USGS Collaborative Gas Hydrate R&D Project conducted an extended-duration production test from the sub-permafrost, gas-hydrate saturated B1 sand reservoir (unit B) at the Kuparuk State 7-11-12 Site in the Prudhoe Bay Unit...
Authors
John W. Pohlman, Michael Casso, Lee-Gray Boze, William F. Waite, Stephen C. Phillips, Carolyn Ruppel, Melanie Holland, Jun Yoneda, Motoi Oshima, Akihiro Hiruta, Timothy S. Collett